PSYCHE 
[February 
I 6 
I. 
Tuft A, 
(See Fig. 2.) 
A large tuft of long 
or short movable hairs 
at apex, often a line ex- 
tending down the chiti- 
nous strip toward the 
double spines. 
Long patch of short hairs. 
Some slender, some 
spine-like or thickened 
and split, on side of 
chit in strip farthest 
from pulpus. Usually 
a few hairs on side 
next pulpus. 
Labial Plate. 
Nine to 33 teeth; in 
general tending to 15- 
23 rather fine, evenly 
graded teeth except in 
the long breathing 
tubed species \Chere the 
teeth show a tendency 
to irregularity difficult 
to describe but easy to 
see. 
II. 
Of immense, flat setae 
serrate on one side. 
Same, but the hairs 
not thickened but close- 
ly set. 
Coarse, bluntly 
rounded teeth, ii in 
number. General shape 
of plate ellipsoidal, a 
regular outline. 
III. 
A row of pajiillae, 
bearing several short 
hairs each, extending' 
along top of body of 
maxilla from end near- 
est palpus about half 
way ; a row of erect, 
hooked hairs for about 
the same distance, con- 
tinued into a thick mass 
of hairs curling down 
across the top ; a bunch 
of short spines at end 
farthest from palpus. 
Many short, curved 
hairs in groups on up- 
per I3 next pulpus, set 
thickly on upper mid- 
dle I3 and upper and 
lower farthest from 
pulpus. 
Coarse, much sepa- 
rated, rather sharp, ir- 
regular teeth, 9. Not a 
regular curve. 
IV. 
In Psorophora a row 
of short, flat, triangular 
spines along the aj)ex 
from base of pulpus, 
curling over and con- 
tinued in a patch half 
down the side on the 
half away from the pul- 
pus, at the third far- 
thest from the pulpus 
these spines are very 
large, hooked and in 
3 rows. In Megarlnnus 
a large patch of straight, 
short spines and one 
long, slender s])ine on 
side of emargination 
nearest pulpus; a dou- 
ble row of large, hook- 
ed spines on farthest 
elevation, continued in- 
to a graded row of 
straight spines down 
mesal margin, and i 
hair-like spine. 
Wanting. 
Teeth tend to coarse- 
ness and to have center 
and end teeth largest in 
P.-<orophora. 
